Table 3.
Positive Predictive Value of Individual Case Definition Plus Anticoagulant Use for Identifying Cases of Cerebral Venous Sinus Thrombosis
| Case Definitions (ICD-10-CM Codes) | TP, n | FP, n | PPV, % (95% CI) |
|---|---|---|---|
| G08: Intracranial and intraspinal phlebitis and thrombophlebitis | |||
| G08 as primary diagnosis | 4 | 0 | 100.0 (40.0–100.0) |
| G08 as primary or secondary diagnosis | 13 | 1 | 92.9 (66.1–99.8) |
| G08 as primary, secondary, or tertiary diagnosis | 18 | 1 | 94.7 (74.0–99.9) |
| G08 in any field of diagnosis | 24 | 1 | 96.0 (79.7–99.9) |
| I629: Nontraumatic intracranial hemorrhage, unspecified | |||
| I629 as primary diagnosis | 1 | 0 | 100.0 (2.5–100.0) |
| I629 as primary or secondary diagnosis | 3 | 0 | 100.0 (29.2–100.0) |
| I629 as primary, secondary, or tertiary diagnosis | 3 | 0 | 100.0 (29.2–100.0) |
| I629 in any field of diagnosis | 3 | 0 | 100.0 (29.2–100.0) |
| I636: Cerebral infarction due to cerebral venous thrombosis, non-pyogenic | |||
| I636 as primary diagnosis | 10 | 0 | 100.0 (69.2–100.0) |
| I636 as primary or secondary diagnosis | 12 | 0 | 100.0 (73.5–100.0) |
| I636 as primary, secondary, or tertiary diagnosis | 12 | 0 | 100.0 (73.5–100.0) |
| I636 in any field of diagnosis | 13 | 0 | 100.0 (75.3–100.0) |
| I676: Non-pyogenic thrombosis of intracranial venous system | |||
| I676 as primary diagnosis | 39 | 0 | 100.0 (91.0–100.0) |
| I676 as primary or secondary diagnosis | 54 | 0 | 100.0 (93.4–100.0) |
| I676 as primary, secondary, or tertiary diagnosis | 60 | 0 | 100.0 (94.0–100.0) |
| I676 in any field of diagnosis | 64 | 0 | 100.0 (94.4–100.0) |
Abbreviations: TP, true positive; FP, false positive; ICD-10-CM, International Classification of Diseases, 10th Revision, Clinical Modification; PPV, positive predictive value; CI, confidence interval.